Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details)

v3.8.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) $ 90,090 $ 154,455
Foreign currency translation adjustment (5,503) 1,373
Other comprehensive (loss) income (5,503) 1,373
Comprehensive income 84,587 155,828
Reportable Legal Entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) 90,090 154,455
Foreign currency translation adjustment (5,503) 1,373
Other comprehensive (loss) income (5,503) 1,373
Comprehensive income 84,587 155,828
Reportable Legal Entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) 86,686 45,881
Foreign currency translation adjustment (187) 55
Other comprehensive (loss) income (187) 55
Comprehensive income 86,499 45,936
Reportable Legal Entities | Non-Guarantor    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (331) (366)
Foreign currency translation adjustment (5,316) 1,318
Other comprehensive (loss) income (5,316) 1,318
Comprehensive income (5,647) 952
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (86,355) (45,515)
Foreign currency translation adjustment 5,503 (1,373)
Other comprehensive (loss) income 5,503 (1,373)
Comprehensive income $ (80,852) $ (46,888)